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Reagents and conditions: (a) Ac2O, then H2O, room temperature (rt); (b) H2SO4, HNO3, rt; (c) 6 N HCl, reflux; (d) 2,4-difluorobenzene-1-sulfonyl chloride, pyridine, rt, 1 h; (e) SnCl2·2H2O, DMF, rt, 24 h; (f) Ac2O, fuming HNO3, –30 °C; (g) BrCH2CO2Me or BrCH2CO2Et, K2CO3, DMF, rt; (h) H2NNH2·H2O, EtOH, 90 °C; (i) various ketones or aldehydes, EtOH, HAc, rt, or reflux
